Stapling machine



Dm.v 20, 1938. E. KRANTZ 2,140,588

STAPLING MACHINE.

Filed July 25, 1935 1 40- ent invention;

` Y Patented Der..y 20, 12938 .OFFICE 2.1405588 ,frsTAruNGMAcHINE dward Krantz,jChicagojjgIll., -assgnor tol Ace -Fastener Corporation, Chicago, 111.-; a-corpora -tionofl Illinois fnpplicationmluly 25, 1935,;.SerialgNm 33,109

, 26 Claims.

" invention relates v.td an` improvement,7 in

" 'yst'aplingfmachines;*ofxthe type having a magazine f'zfor preformed staples. f

:JOnenofftheobjects'ofthis .invention is to pro- ;5 :vide a staplingmachine havinganimproved type 1. of ejection chutethroughfwhich .staples are .tdriven one .byone from the magazine,the parts f -.comprisingthe ejection chute beingsoV designed :and related thatthose parts receiving the greaty 15.10 Aest, wearare readily replaceable while f eliminating the usual inaccuraciesfof allocation Apresent in Y devices of thistype.

.Another p obj ect of the invention is `tol-provide' Y 1;. astapling. machine having an improved type "of c5151 mechanism -forV positively .supporting the staple iny lcontact with thefstaple driving blade during -themajor portionof its. stroke.

e Another object 'of the inventionis Ator provide astapling machine having improved-V means for 1.20.V insuring a yfull driving vstroke ofthe plunger and staple driving tool,V the means rbeing so designed and related to the other parts -of the,-device as-to be susceptiblev of 4convenient. and comparatively inexpensive manufacture and `yetdurabley and .25 reliable in use.

` A `still further object of the invention is to prorhvide a stapling machine having` an improved jmeans `for supportingand adjusting the tension oft thespring which actuates thestaple Vfollower octhrough the magazine.

Other objects and advantages reside in certain .novel features Vof the construction; arrangement and combination `of parts which will be herein .afterv more* vfully described and particularly 355pointedr0'ut in the appended claims,y reference v 40" sake 'of illustration;

Figure 3% is. a detail viewof the mainy housing y showing the manner of notching the walls;

. ligurel is 'an enlarged. detail view .showing tothe staple v support mechanism in its extreme p0- l sitions of movement;

Figure 5 is a detailview in perspective showing the plungenstaple driving tool and thermovable f 7part lof'. the staple support mechanism;

'55 .j Figure 6.is` an enlargedssectional view showing :.thegzplunger-.and the-*movable part of the fullgrstroke mechanism;

, Figure '7` is a.l viewin yperspective of the forward end of the core of the staple magazine;

l Eigure 8 is a -view in elevationshowing the die., .blockofv the jejectionchute;

s lFigure 9. is a view-.ln .elevation showing a modi- ,.-ed formn off-die block for the; ejectionA chute;

FigurelO isaffragmentary view in section taken'onlinefIU-III-of Figure 2;

Eigure 11Y `an 4enlarged view-.inv side. elevation .showing the 'follower spring terminal; and

LFigure 12.1is afragmentary view in section taken onzline I2-.I21of Eigure l1.

. Referring,,tofthe`A drawing, itwil1-be seen that the stapling machinecomprises generally aA base .f Il; adjacent oneend of which'is an anvil 2. At I theend-,ofnthe base opposite the :anvil is mounting for. a beammagazine or staple carrying arm e 4. .The end/:of qthenmagazineiopposite that.` ,mountedftothe base supports amain housing 5 f Which;pr,ovides; a. supportjor the'staple driving mechanism designated generallyat. The hous- .ing also. SUDPOrtsthespring. 'I Vwhich operates `;themechanismfor feedingstaples through the;` -magazine.

The base I, consists of a; metallic plate-like .memberfoffinverted dished form which is supportedby cushioningpads 8. contained within the l:margnalgflangesv 9 of the base. .fixed:toyfthe base in 1any:suitable manner and is of therfbustomarydesign well known in the art. lj'I'hefrearward-end ofxthepbase is formed with a 1depressedportion LIIlwhich is shaped to receive #in close fit the;mounting yor bracket member 3,5, :fthe depressed portion acting to properly aline the :bracket member in relation to the base and anvil, Theybracket member 3 is provided with spaced upright members II. betweenwhich the beam :magazine 4- is mounted and guided. VThe bracket :member-is securedto the base by riveting, weldzing,- or-anyfother suitable method common in the art. The upright members form the support for a pivot'l 2 which extends between them and which -passesthrough the beam magazine 4. The beam magazine is rotatable about the pivot I2 but is .confined by .the pivot and upright member to travel 7inproper alinement with the anvil 2.

The beam magazine is urged to a raised posi- 'tion relative .to thev base'by the action of a coiled "compression spring I3 and an upright limit member I4. vBetween the .spaced upright members IIand forward of the pivot I2 the base I is provided with a slottedopening I5. The member l:|41ielde11dS-f-,through the opening I5V into the The anvil 2 is?.

spring has one end seated in the opening II and A against the base I and the other endl seated against the underside of the cross-extension Ia.

A circular protuberance or some similar devicel may be formed on the cross-extension I 6a for the purpose of centering the spring. The upper side or the cross-extension rests or presses against the beam magazine. It will thus be seen that the free end of the beam magazine is normally maintained at a fixed distance above the base but upon receiving a downward pressure suicient to overcome the compression 'of spring I3 will swing downwardly so that'it contacts the base or anvil.

Y The beam magazine or staple carrying arm 4 is of elongated form and comprises a core or staple track I3 of general inverted channelshape'd form and a guide member I9 also of simi-v lar form superimposed on the core I8 and spaced therefrom. Preformed staples ride in straddle fashion on the core I8 and are contained in place by the guiding action of the member I9. The member I9 is properly spaced from the-core I8 by spacers 2|!l (see Figure 2) struck inwardly from the bottom portions of the side walls of the guide member I9. The members vare secured in this position v'either by rivets passing through the spacers 2`or some other suitable means such as welding. The top of the guide member I9 has a centrally located elongated slot 2| cut therefrom which extends from the rear end thereof to a point substantially near the rearfwall of the housing 5. This slot accommodates the nipple 22 of the staple follower 23 as will be later described.

The forward end of the top of the guide member extends within the housing 5 and projects forwardly beyond the top forward end of the core I8 to' form a guide 24 I(see Figure 4) for the? staple driving tool 25 insuring its proper` alinement as will be later described. Just rearwardly of the guide end 24 the top of the guide member I9 is provided with a spring centering protuberance 28. The sides of the guide member I9 at the forward ends thereof are provided with laterally projecting ears or flanges 21 and 2'Ia which provide a support for and means for aiding in securing parts of the staple ejection chute to be later described. The forward edges of the side walls of the core I8 are provided with forwardly extending projections or tongues 28 (see Figure 7) which act as dowels and interlock with parts of the ejection chute for the purpose to be later described. A further and additional set of projections 28a may also be provided as will be more clearly pointed out in the following paragraphs. K

The main housing 5 comprises two oppositely symmetrical sections 29 and 29a (see Figure 3). The sections have an outline form similar to a quarter section of a circle. The sections 29 and 29a have elongated lower portions secured to the respective side walls of the guide member I9 at the forward end thereof by rivets or some other suitable means. The forward edges of the sides of sections 29 and 29a are formed with inwardly and thereafter extend rearwardly and in ap-` proximate parallelism to provide the supports and guides for the follower spring 1. The rearward edges of the sides of sections 29 and 29a are provided with inturned and abutting fianges 33 and 33a' designed toy aid in properly spacing the sec-v tions and to complete the enclosure for the spring l. The flanges 33 and 33|a extend downwardly only to a point suiiiciently spaced from the top of guide member I9 so as to form anopening or outlet for the extending end of spring l. The flanges 30 and 3l)a extend downwardly only to a point approximately level with the top of guide member I9. At this point the lower front edges of the sides of sections 29 and 29a are notched or cut away to provide room for the flanges 2l and 2'Ia which extend from the guide member I9 (see Figure 3e). When the sections 29 and 29a are assembled in abutting relation as indicated by the View shown in Figure 3 they provide avrectangularly shaped well W (see Figure 3) the inner surfaces of which form guides for the plunger 32 asV well as a housing for spring 1. A cap 34 of inverted dish-shape is snugly fitted over and against the upper portions of the sections 29 and 29a immediately over the rectangularly shaped well.

The cap is secured to the sides of the sections in any suitable manner, preferably by little screws which permit of easy disassembly. The cap 34 acts to keep the sections 29 and '29a in abutting relation and thereby aids in maintaining the rigidity of the housing 5. The cap is provided with an aperture through which the stem 35 of the plunger extends and isfoperable. The cap valso acts as an abutment limiting the upward travel of the plunger 32, the staple'supporter 3l and the sliding member 36 of the full-stroke mechanism.

The staple feeding mechanism comprises kthe follower spring 7, the staple follower 23 and A attached nipple 22, the finger grip attaching clip 31 and springV terminal 38. The spring 'I is a ribbon-type spring wound in a volute coil. The inner end is secured to the flat cross member or connection portion 39 of the terminal 38 by a rivet or other suitable fastener (see Figure 12). The connecting portion 39 Vis Vapproximately the same width as the spring I and has extending vertically from its opposite ends opposed and parallel side plates 49 and 48a. These plates are designed to rest snugly within and against the inner surfaces of the rearward portions of the sections 29 and 29a of the main housing 5 and are guided thereby. The section 292L and the side plate 4I)EL are provided with round openings 0r holes axially alined. The section 29 and the side plate 40 are provided with rectangularly shaped holes axially alined with each other and with the round holes aforementioned, the greatest diameter of the rectangularly shaped holes being less than the diameter of the round holes. A shaft or axle 4I extends between the sections 29 and 29a and is provided with a round or circular portion adopted to fit in the aforementioned round holes and a rectangularly shaped portion adapted to lit in the aforementioned rectangularly shaped holes. The shaft thus positions and secures the terminal 38 in the main housing. By 75 emovinglthezshaft 4 baxiallyrsolthat ltherectan'gu- Yflansportionafis onteof engagement-twithgthe:rec-

tangularly shaped@moleginnsectionr29nandiuyet -rema1ns =:engaged *..withvlthe rectangu'larsholeiin the 5 eplate Gland then rotatingqthe shaftzwhilefinthis :,positiontheterminahszwillibeyrotatedrwithmhe shaft '14I ,f thus.;- afftighteningf;orisloosening. mfrgthe ,-5:tension-:offspringi'1 is: accomplished. `lilhenithe .g desired tension is obtained the shafts-Mns -moved lo; axially'zso; fzthat; @theareptangularmshaped ;portion mis aga-in; engagedlxwthathe: rectangularlyhaped holerinpsection ;-29. v{shafts} I qid-,andiiterm-inal w38, will :then be flockedii position -i'IherashaftIl l is ;--preferably;providedewithz. :f head gandstsorew vidrivenfslot at the endadjacenttheround p ortion andi an :extendedz` .andfthreadediportiere` adjacent fthe lirectangular-ly -rshapedgrportion The .head f ,.providesa readymeansffor rQtaztingat-he shaft/4I -v while. a.,nut may@beplacedionwthe threadedgpor- 3:20* ftion and;- adjustedto Vrest-von *,the-p` outsidegpff fthe l section 29 to t-preventelateral fdisplacementqof fthe eshaftfvexcept'when required` for adiusting pur- ;poses. The outer/orf .free endy-.of f-,thepspringi 1 passes outsidenof` .fthefmainnhousingn 5 zand has f ga securedto it: a 'nger clip.l V3.1. The-clip v*31e-"basl a f fwidened-,-portion-preventing itsaentrya-into the housing 5. The widened-portionis .proyidedI-.with s, an aperturersuffciently largefin di-ametersto. allow it to be inserted ,overt-and downeon lthefnipplef22. 5:30 v Thetensionf in the spr-ing 1 keeps thefclin. 31\ and i V,nipple v-225 in operati-yeengagement. Theollower ..23 v.consists l-Yof aan*y elongatedrinverted channelshapedapiece adapted to lride onf vfthe: icorewor :staple: track.-I8. l'hefgnipple,,.22 ris rivetedmor L55 otherwise secured to .the rear .stop -.portionE pf. .the follower: .23. :It iwill fbefseen fromthe foregoing gtdes*criptionfY that the spr-ing 1 ,-facbngithrough -the clip 31;.andlnipp1e l2 2.5. will lcause,theiollowen#3.vto advance iforwardly1 through their. beam vmagazine ,L-40g, and .forcestaples riding on the, more^` rI gtoward v)andcunder the staple A.driving lt0ol-25the.s1ot, 2| 1in the .guide :memben I Q r:permitting thenip1ple 22 `,to-.advance fiar enouglat'oward; theiiorward end of, .fthe-magazine to.: lettthe\. f,orwardAend1 otfthe gil-,Q.followerv23-advancef a, last 4fremaininglstaple into theeprnperposition. By4 ,remoying the-clim 31 from thenipple22 the tollowerlmayrbelmoved l rearwardly ,Vfrom, t-heAA rnagazineaf` to .g permit the .chargingrofsaidlmagazinawith a fresh sapplyof bwstaples. v A f s The f driving., mechanism1.,c.onsists. Y of-re ;ipro callyi acting plllllgerff 32, whichrtlcausesa driving toolv25 .toengagestaples .from theiorwardgend t f of. themag.azineY and` force them tout;through., ,an 'ejection ,chute (indicatedllgenerallyf,at E) ',1, he action of the-plunger 30, ismnodified,v by aliull- ,'.stroke mechanism indicated, .generally-.at Ewhile the; action of. vvthe driving toolj- ,2 5,.:is, .aided by.. a staplesupporten 3 I Y The plunger^-32 .consista-,oi a-tmetahblochof ltour-sided; or: 'polygonal shape. .f v The; interior of f, the plunger.V 32 is hol1owedfout:from:- the bottom upwardly-as Yat 42 to .receive and 5'guide thefcompression spring 442. -lIhe fplunger is r4guidedzfin"the rectangular well W formed'gin thermain housing 5 as previouslyzdescribed. 'Theflower `end offspring l '42 rests against the topfoffthexguidesfmemberrfIQ and isheld'in-positionbythe:protuberance. s f Secured to the top of the plunger f42 is afstem65. ffU The stem 35 may be formed. separatelyfrom the plunger and riveted thereto inthe customary ymanner indicated in Figure 6 or `formedfrom the fsa-me piece of metal as thefplunger. 'The steml35 `ispreierably `round and of smaller. diameterthan y `the plunger. ThevsternL35==extendsxthroughfan -raperturenini the cap ,34:eandyis1provided at .its supper ende-witlrlaapresserfknob: 43`whgh issecured -inafsuitableimanner such asfrixfeting or welding. adtiwillbeeseen that A.downward pressure placed on r heilnobei will'lforcetheplunger 32-downwardly thel1ousing:.,=until'zthe;bottom.of the plunger 1 rests.. against lthe top of; guide; memberA I9 which @limits-3suchfiduwnwardemotion. The springen, l, ng: compressed; into, the hol1owedout..` portion tZ-tasethe plungercis forceddownwardlwwill forcee, zlthesplungeraupwardly; when, the :downward pressure' vremoved. 1;,Theupwardfamovement:of the nplungerrwill-nbeeli ed bylthelcap; 34L whichv acts alas ang/ abutment ,Theylowen portion of the for- --iwa1rdlaceofithe plungerlZ-.is recesseds. ,at 44,-15 aand;therupnernportionofthe Staple driving blade F125 is .fitted-int this 4recess- ;'.I;`he\tree ssf.proridesia ashouldertwhichbsrbs thethrustzforces between then: suitable dex/ice. The ,-rear` yface of 1 ,the

, nger-32iseprovidedewitha longitudinalchanlseextendine irom; :top :tabottom of ysaid ,plnngen 1'1l1efshannelrll is centrally located ,ewith?` lrespectpto the fside facesof the vplunger and;J isfpfisuflicienhdeplihrand: width to accomodate aparts Ofilie fullfstroke mechanism F.

,The'staple driving-toolr 25 consists of a thin flat pieceoi hardened metal. -Thewidth ofthe tool is, slightly greaterl than the bridge portions of the U30 staples which it isdesigned to f drive. `With the A,plunger 32.- in its;y uppermost l-positionfwithin the ,housing 5 andtwith lthe upper portion of the tool I :securedftog the plunger asvpreviously; described, thebottom or rdriving edge rof the tool- 25 extends 35 .ingfront of and guided bythe forward top end .offtl-le, guidemember -I 9 (see 24 in Figure 4), and ,aisvsiuicientlyf elevaitedfto allows a staple `to venter beneath it :from-althevmagazine. When `in this ,.position; thevdriyingtool is` guided from in front 40 bythegdejection'chute-cover plate 41. From the ,fonegoing, ,itwillbe speen vthat the driving tool at ;the;=.b ,eginr xing-zof,its strokeis,accurately located Landpconlned in its movement by both ifr-ront and irear guides. ,v

TheA ejection or, discharge chute Er comprises two removable meinbers-namely, ythe coverl plate III'I.andthedieblockor die platemember.48. The 4V,coverpplate:member 41 extends across the forward yendrof the magazineland has lateral portionsex-. V`:tending.beyondthe sides ofthe housings to the" same .extent asthef ears or flanges 21 and 21a. -Thetop of Ytheover plate abuts againstthe lower -Qedgesofthe flangesand 30a. The bottom yof lthe .coverA plate is approximately level with the- 55 b0ttomof;'the beam magazine. The ycentral porw vtion .of the coverplatefis offset to conform with the-,loiset portion of the anges j3ll and 30BL for the fpurpose of providing a-space for the staple sup- `aportger 3,I. On the innersurfaceofthe cover plate ,60 and adjacent Y, the junctures ,of .the onset portions swith'; the. lateraleportions,v there is .provided accurately `dimensionedvertically extending grooves or-"shoulders49. "Theseshouldersor grooves ex- @tendy Iverticallyffromithe top to the bottom of the i.155 :.cover ;p1ate andfform opposed surfaces which are .spacedffrom eachother af distanceconforming to 1the width ofthe vblade l 25r and lateral forward sur- ,.faces ragainst; whichthe forward face of the blade 25 rests.f"'Ihe- .lateral forward surfaces are inx70 dented, intoithe surface of the cover plate a depth ysubstantially:equal to the thickness of the blade 12 5. l#.Itv will be fseenthat, withthe cover plate restf-ingsflatly. against:.:the die-plate member 48, the opposed-, surfaces1,r and lateral forward surfaces i75 form with the surface of the die plate member Vaccurate guides for the driving blade25 and Y staples being driven .out through the ejection Y locate it with respectV to the die plate 48.

chute. Centrally located in the lateral portions of the cover plate are apertures, the edges of which are formed with dowel locks 50 (see Fig'- ure 10) flttable within apertures in the die plate member 48 to accurately and positively lock and position the cover plate and die plate in a fixed and predetermined relative position. The lower part of the offset portion of the cover plate is provided with spaced openings 5I (see Figure 4) which form an element of the staple supporting mechanism, as will be later described. The die block or die plate member 48 (see Figure 8) consists of a piece of flat hardened metal. It extends laterally from the outside edge of flange 21 to the outside edge of ange 21a and vertically from the bottom of the magazine to a point level with the top of guide member I9; It is to be understood that the apertures in the cover plate 41, die block 48 and flanges 21 and 21ab are axially alined to per- Init of the use of a screw or some other fastening device to hold these partsin close surface to surface contact, as illustrated in Figure 10. The die plate 48 is provided with spaced apertures 52 into which the tongues 28 on the core I8 snugly fit. The intertting relationship thus established between the core I8 and the die plate 48 accurately allocates the latter with respect to the former, while the dowels 58 on cover plate 41 accurately The accurate positioning of the ejection chute E is thus maintained irrespective of the screws or other means by which the various elements comprising the chute are removably held together. The die plate 48 is provided with spaced slots 53 extending downwardly in vertical parallelism from the top thereof. The outer edges of slots 53 are in alinement with the inside surfaces of the side walls of the guide member I9 when the die plate is assembledA in place and positioned by the apertures 52 and tongues 28, as previously described. When in this position, the inner edges of the slots 53 abut against the inner surfaces of the projection 28a. The portion of the plate 481 lying between the slots 53 is cut off at a point below the top edge of said plate. This portion resembles a tongue indicated at 54 (see Figure 8). The top edge of tongue 54, when the plate is assembled as described, forms a continuation of the top of the core or staple track I8. It will thus be seen that rthe bridge portion of staples advancing on the track I8 will rest on the tongue 54 just before they are advanced into the ejection chute. It has been previously described how the staple driving tool 25 is guided prior to engaging a staple. As the tool 25 engages the staple and forces it downward the staple and tool will be guided and maintained by the grooves or shoulders 49 in the cover plate 41 and the forward surface of the tongue 54. The greatest wear and severest blows will occur at the top forward edge and forward surface of the tongue 54 and in the grooves 49. advantageous to make the cover plate 41 Vand die plate 48 of hardened metal and to design these parts, as previously described, to be replaceable and yet maintain an accurate dimensional relationship between them. The die plate can be made in a modied form as shown at 48a (see Figure 9).- In this modification the projections 28a are omitted from the forward end of the core I8 and the slots 53a are formed so that the inner edges are in alinement with the outer surfaces of the sides of core I8. The legs of the staple as well It is therefore as the bridge portion will then rest on the tongue 54E. In all other respects the die plate 48a functions the same as die plate 48.

The staple support mechanism consists of an y elongated metal strip or member 3l which lies along the forward surface of the plunger 32 and tool 25 and is maintained in position by the offset portions and 3l)a of the housing 5. The lower or bottom end of the member 3I is formed with a hook 55 which will engage the underside portion of the bridge of a staple as the staple leaves the tongue 54 and enters into the grooves 49 (see Figure 4). Adjacent the hook 55 and positioned slightly thereabove, the forward or outer surface of the strip 3| isV provided with spaced protuberances 56 ttable within the openings 5I. The upper end of the member 3i eX- tends above the top of the plunger 32 and is provided with a rearwardly and laterally projecting vflange or wing 51 which conforms in rgeneral shape and size with the top surface of said plunger. The wing or flange 51 is notched inwardly from the rear edge thereof as at 58. The notch 58 straddles a reduced section 58 formed in the plunger stem 35. The edges of the notch may be provided with circular shaped recess to provide a ready clearance between the notch and reduced section 59 and which will also act to keep the flange 51 in position relative to the plunger and stem. Compression springs 69 are provided between the ange 51 and the top of the plunger 32. The spring may be held in place by seats recessed into the top surface of the plunger. The supporter'3l is guided between the housing 5 and the plunger 32. It is in effect, however, carried by the plunger but has a lim- When the plunger is in arraised position, the

flange 51 will abut against the underside of the` cap 34 and since the spring 42 has a greater compressive force than springs 60 the top of the plunger 32 will abut against the flange 51. In' this position the driving tool will be raisedfto allow a staple'to advance into the ejection chute but the hook 55 will/be directly in line with lower part of the bridge 'portion of the staple and will be urged to bear against the outer surface of the tongue 54 by the action of the protuberances 55 and the front wall of the main housing. Thus, the staple will be supported and will vnot drop down through the ejection chute (see Figure 4). As the plunger causes the driving tool to advance downwardly the supporter 3| will remain stationary until the driving tool engages the topof the bridge portion of the staple. This is true because of the reaction of the springs 58 tending to force the supporter upwardly relative to the tool and plunger. However, when the tool engages the staple and starts forcing it down, the

staple, acting through the hook 55, will cause ther supporter to travel downwardly with the tool and plunger. It will be seen that the reaction ofV springs 88 will cause the hook to support the bridge of the staple firmly against the driving edge of the staple tool.

When the staple is advanced by the tool to a point where the staple legsV are extending out from the bottom of the ejection chute and only a small fraction of the driving action remains to be accomplished, the protuberances 56 will enter into the openings 5I which will allow the hook 55 to move laterally out from under the bridge of the staple and the driving tool. The tool is then free to force the bridge of the staple tightly against the material into which the staple is 2,140,1sesially.. toward and .under fthe .driving blade; toi-rez;

top 4or staple receiving. position previously; des-- scribed. lil-i2 structure member- 6| secured within thexhousirig V and to the rear Vof the plunger 32; The=teeth;: areY of the usual rack variety commonly usedzwith.; rackand detent devices.y The'teeth 'are-frm'ed';

?. onv the forward edge of the^member':6|,= iandlare".

. slightly offset (see Figure' 3)'. fromythe general'. plane of that member so as to.be Vcentrallyil cated with respect to the well Thefbodyxpora 36N (see Figure 6) havingat its upper end-ia--rear-x-gY 1ward1y offset portion to which is secured aq-detent trigger spring- 62. The member- 36 isrnotchedf.

` as at 63 to provide a camming surface-ondetent' withdrawer. The-member'f36iis retained. within the. channel by a detent 64 -whi'chf Overl-ies'fthe 355;..member 36 and :which is -pivoted to the-sides fof-i.

the channel in any suitable manner. The-detent;w

64 has an upper or-toothfengaging ar'mf-whi'chis forced outwardly from the plunger-,bythespring-` 62 to engage with thefteeth onf-the member; 6|. 40 Theilower portion ofthe-'detent 6l-is formed-with inwardly projectingspaced-.side plates'which'- straddle the -notch 63 inthe--slide member,l 36'.- The slide member is slightly-longer thanithe verf-'- ticalr length of plunger' 32.r 45. raised to the staple receiving portion; the -cap- 34 acting through the flange' 51 -will abut -theftopfi otmember 36 and slide it downwardly-'witlr-res spect to the plunger and detent so that thefn'otch '63' will bev in'alinement-withethe side plates-tof," the detent. In this position the spring-62 bepermitted" to force the--tooth=engagingfarxir of" j the detent into operativeengagement `.with the'topf:

Vteeth onmemberv 6|. As the: plunger iside-j pressed to cause a stapleto be-f'driven;A ther-def-v 5'5 tent will-.engage succeedinglylower .teeth thfere-Vv by-preventing the plunger tojbe raiseditovthef.L

staple receiving position. -Howeven when: ther-- plunger is v .depressed sufficiently to: completer ly eject a staple, the bottom` of slide36-fwi1l strike-'.- r.against the top of guide member |9 and-causethe slide 36 to move upwardly with -respect tothe follower and detent. This moVement-cau'ses-the-'f lower-edge of notch `|53 to act asa camming--sur'-- faceto force the side platesof the detent out ofthe notch -63- and causing the-tooth engagingffarm.`

to recede from engagement withthe memberl i atthe same time forcibly depressing theispring; |52',A The plunger willxthen loealloweditofmeve,

Y upwardly until it again regains the-staplei-reemceiving .position at which time-'the detent-is: moved to active position asaforementionedfl ItV willv be'seen from the above that thefplungerz'must always cause. a staple toL-,befcompletel'y ejectedfA .before receiving a new staple. f

75,; .Whi1e constructions iniwhichFthis: invention-e.-

The full-stroke mechanism includesfa toothzi..

With theA plungerr have 3 beensele'ctedi-.merely s for: the purpose of v illustrationtand that variouschanges in the size, 5 `lease theprotuberances-56 from .theDpeningsL-S thereby allowing :both plunger Land supporterA to? again raise. under the force'of springstozthean shapeandfarrangementsof the parts'may be madev without-'departing from' the spirit. yof the invention onithescope-.of the subjoined claims.

The einventi'onf :claimedI isz:

Inva-.stapling idevicefa abeamf magazine .having a core forming astapleI-track andside plates tofguide-theistaplesxon said-utrack; laterally pro-v jectingzears at the; forward'end of said side plates,

a plateson.:saidsea-rs;Y and.forming a part of a.

staplezejection ychute; a. second/plate completing said';;ejection chute; staple drivingmechanism, andsaahousingffo-rsaid-staple driving mechanism positionedfgon :said .-'magazine and having ,a cut awayportionfthrough which said ears project;

2; ,Inai-.deviceofthe type specified, a magazine for staples-:andan: ejection chute operatively relatedc.;thereto;.saidfgej-ectionx chute` comprising; a

' die iplateimemberanda-cover.:plate member, said membersi having-intertting lugs rand .recesses formed thereon providing interlocking aliningv means'.and:sbeingiremovablyzsecuredito saidpmagprojecting; tongues on@ the front edges of the sides :fo-fs'aid; core a .slotted plate at the .forward end fof .said-core land. formingiza: part` of A:af-.staple ejection chute; a portion-of .said "plate, beingin.`

alinementrwith the top surface:.Ofsaid-:coreand actinguas. aaguide :for the bridge of. staples, saidV V:ifv

tongues-1projectingrthrough v:said slots and L acting as. a; :g.uide 1 for: the tinside. faces .of staple legs .to deliver.:the-fstaplesztosaidJejection chute.

4. A beam magazine for staples having..a;core.

uponizwhich .ther-staples aride.. ,az-slotted. 7and aperituredplateiat the forward: end of. said core .for-me ingra. partofian:ejection-lchute, said core having.

tongues` extending. into such 'slots and. apertures,

the .tongues extendingintozsuch.slots. guiding the staples to...thegejection` chuteandvthe tongues ex,- tendingjnto such? apertures .positioning said plate inarelation. tosaid;core:

5;-A staple4 carrying-arm having-a core upon which stapleszride; aeplateat'the forward endof said; core-.and :for-ming apart'of an: ejection chute, a portion of said core extending through said plate-:tof guide thezistaples .tofthe ejection chute, and a-portion' of sai-dplate forming a continuation of.,"acportionzofY said coreiandalsoacting. as 'guide ing; meansfffor the.; staples f to the. ejection chute.

6^.; A beamfmagazine forstaples having a core over .which ,the lstaples it; azplatefat .the forward endsof lsaid:magazineaforming a part of an .ejectiorrf'chuteportions,of"said plate. and core in. terlockingf; andfzportions.- of isaid corel and,.plate formingpmeans'zgto guideuthei interior of` staples as they pass to the ejection'chute.

7'.- LInra fstaplecarrying.` ar.mzhaving'v a` core upon whichy fsta-plesride'r and iside-plates toguide 1 theV staples. on; saidaecore;f,a .plate-:forming Va part of anV `ej ectiorrchute 'and having-meansinterlocking.

with portions-'of :saidcore to position said plate, said. side plates having laterallyy projecting ears extending-fromzfthe sides thereof, said plate beinglsecured:tofsaidears-to hold'sai'd plate tov said staple carrying arm, staple-.driving .mechanism for driving.; staples; .and a housing-.for said mechanism .positioned von fsaid arm andl having-.portions overlapping4 said. sideA plates, .said portions being notched. tof receive: said.. ears.

8: .In -aebeam-magazine for staplesya core, guid-,

maypeaembodiediiaveebeen shownzanddescribei. it .is .f-be. understood-'."that Athese. constructions ing means for staples on saidcore, an ejection chute for staples at the forward end of said core, a plate forming one of the rwalls of said ejection chute, said plate having openings therein, portions of said guiding means extending into some ofsaid openings, the top of said core terminating adjacent said plate and forming therewith a track for said staples, the sides of said core extending into other of said openings and vforming the side guides for said track.

9. A beam magazine'for staples comprising a core forminga staple track, and guiding means to guide the staples on said track, a staple ejection chute at the forward end of said magazine, said chute comprising two members, said members forming a rear guide, side guides and a front guide for the staples as' they are discharged through said chute, said guiding means having flanges extending laterally from its sides, said ejection chute members being mounted upon said anges, staple driving mechanism, and a housing for said mechanism positioned on said magazine and havingnotched portions for receiving said flanges. Y

10. In astapling device, a beam magazine for staples consisting of a core upon which staples ride in straddle fashion and a member secured to said core and having top and side portions spaced from said core and forming an outer guide for staples on said core, a housingat the forward end of said magazine, said housing comprising two sections, each .section having a portion overlapping and secured Yto said top and side portions, an apertured cap about the top of the housing and holding said sections in spaced relation, and a staple driving plunger movably mounted within said housing and operable through said aperture in said cap.

11. A stapling device having a beam magazine for staples, a housing mounted at the front end of said magazine, a reciprocal 'staple driving tool within and guided by said housing, an ejection chute for discharge oi staples by said tool, said chute comprising a plurality of plates, said housing having a cut-out portion at its forward end, said ejection chute being mounted within said cut-out portion, and ears extending laterally from the sides of said beam magazine out through said cut out portion, said ejection chute being secured to said ears.

12. A stapling device comprising a beam magazine for staples, a housing on said magazine, a

reciprocal staple driving plunger in said housing,

itslower end providing guide means in said housing and a reduced section at its upper end of less width than the lower section, and a cap on said housing, said top portion of said plunger and said cap cooperating to guide the upper end of said plunger, a spring within said housing and extending within said four sided section,vand a staple driving tool connected to said plunger.

14. A stapling device having a staple carrying arm, a housing at the forward end of said arm, a

plunger for driving the staples from the arm mounted in said housing, a knob mounted on said plunger for hand operation, 'a spring within vrsaid housing having a portionv extending into said plunger for returning said plunger toits starting position and a cap intermediate said plunger and said knob and secured to said housing to prevent said plunger from leaving said housing as said plunger is reciprocated within said housing, said cap having portions lying adjacent the outer side surface of said housing andsecured thereto.

15.,Astapling device ,having a staple driving' plunger and guiding means to guide said plunger, an ejection chute throughy which staples are discharged by said plunger, a staple supporter having a hook end mounted on said plunger and movable therewith, spring means urging said hook end to force the bridge portion of a staple upwardly and against the driving face of said plunger, said plunger Vhaving spring means to urge it to its upper position, said latter spring means being of great-er tension than said firstmentioned spring means, thereby allowing theV driving face of said plunger as it approaches its upper position to raise above said hook end of said supporter.

16. In a device of the type specified, a plunger engageable with the top of the bridge of a'staple for driving thesame, a supporter'carried by said plunger and having' a portion engageable with the under portion of said bridge, spring means between said supporter and said plunger urging said supporterV upwardly and means limiting the downward movement of said supporter and providing for lateral movement of said portion to permit :disengagement between said Vportion and thereof with said bridge;

18; Inav stapling device, a housing, a stapleY driving plunger reciprocably mounted in said housing, a tooth structure in said housing, a detent slidable with said plunger, said tooth structure and said detent forming a full stroke mechanism to insure a lfull driving stroke of said plunger, asliding member carried by said plunger and operable to disengage said detent from said tooth structure when said plunger has completed its driving stroke, said sliding member effecting engagement between said detent and said tooth structure when said plungerhas reached its uppermost position.

19. In a stapling device, a housing, a tooth structurev on said housing, a reciprocal staple driving plunger guided by said housing, a detent movable with said plunger and cooperablevwith said tooth structure to insure a full driving stroke of said plunger and a sliding member also movable with said plunger, said sliding member in onepositionthereof being effective to disconnect said detent from said tooth structure and in an- Y. other position thereof leffective-to connect said detent with said tooth structure. k

20. In a stapling device, a housing, atooth structure thereon, a reciprocal stapleV driving plunger, guided by said housing, a detent pivoted to said plunger and cooperablewith said tooth structure to insure a full driving stroke of said plunger, a member slidably mounted and carried Y by said plunger and operable to disconnect or said slide having .a spring and a camming surface, said spring when said slide is in one position being eiective to 'cause engagement between said kdetent and said tooth structure, said camming surface when said slide is moved to another position being effective to move and hold said detent out of engagement with said tooth structure.

22k. In a stapling device, an ejection chute for staples, a staple driving tool reciprocal in said chute and having a driving edge, a staple sup- 'porter in said chute movable with said tool and having a hook portion adapted to engage the bridge of a staple and hold the same against said drlving edge, a spring between said tool and supporter to urge said hook portion upwardly toward said driving edge and means on said supporter and ejection chute to permit said hook portion rto move laterally out from under said driving edge when said driving tool attains a predetermined. position.

23. In a stapling machine, a guiding chute for staples, a vstaple driving tool reciprocal in said ment of said supporter to depress said spring as said tool reaches its uppermost position in said chute.

24. In a stapling device, an elongated base having an anvil at its front end, a beam magazine ,for staples comprising a core upon which staples ride in straddle fashion and a channel member secured to said core and having top and side portions spaced from said Vcore and forming an outer rguide for staples on said core, said magazine being pivotally mounted at its rear end on said base, a housing at the forward end of said magazine comprising front and side walls with each side wall having a portion overlappingI -the top and side portions of said channel member and secured to the side portion of said channel member, an apertured cap about the top of the housing, a staple driving plunger movably mounted within said housing and having a portion projecting through the aperture in said cap for operation of the plunger, and a compression spring disposed within the housing andr interposed between the magazine and the plunger to urge the plunger outwardly.

25. In a stapling device, an elongated base having an anvil at its front end, a beam magazine for staples comprising a core upon which staples ride in straddle fashion and a channel member secured to said core and having top and side portions spaced from said core and forming an outer guide for staples on said core; said magazine being pivotally mounted at its rear end on said base, a channelled follower slidable on said core in the guide way formed by the channel member secured to the core and having a knob projecting upwardly, said channel member having a slot in the top portion through which the knob projects, a housing at the forward end of said magazine comprising front and side walls with each side wall having a portion overlapping the top and side portions of said channel member and secured to the side portion of said channel member, an apertured cap about the top of the housing, a staple driving plunger movably mounted within said Yhousing and having a portion projecting through the aperture in said cap for operation of the plunger and a recess in its inner end, a compression spring with one end received in said recess and the other end abutting the top portion of said channel member to urge said plunger to inoperative position, and a coiled spring tape within the housing having one end projecting from the housing for detachable engagement with the knob on said follower.

, 26. A stapling device comprising a beam magazine for staples, a housing on said magazine, a reciprocal staple driving plunger slidably encased Within said housing, a staple ejecting blade carried by said plunger, said plunger having a recess therein opening through the bottom end thereof and a round portion at its upper end for projection from the housing, a cap piece mounted on said housing and having an aperture therein providing a bearing for said round portion of said plunger, and compression spring means contained in said housing and extending within the recess in said plunger for urging said plunger upwardly.

EDWARD KRANTZ. 

